Here are the answers to the 20 MCQs from Chapter 1 "Matter in Our Surroundings" (Class 9):
- c) They are stationary
- c) Gas
- c) 100°C
- c) Evaporation
- a) Oxygen gas
- c) The heat required to convert liquid into gas without temperature change
- a) Solid
- b) Directly changes from solid to gas
- b) Melting point
- c) Steam
- c) Melting
- d) Increase in wind speed
- c) Gas
- b) Pascal
- b) Camphor
- b) Due to weak intermolecular force and free movement of particles
- c) It remains constant
- c) Particles of a gas
- d) Colour of the liquid
- a) Solid
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